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Which of the following is true of vaccines? Vaccines are effective for all known communicable diseases....

Which of the following is true of vaccines?

  1. Vaccines are effective for all known communicable diseases.

  2. Vaccines can produce the disease it is intended to prevent in those with reduced immunity.

  3. Vaccines are especially effective for the very young and the elderly.

  4. Vaccines are more than 95% effective.

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Answer #1

Option B is correct/ true statement about the vaccines

As vaccines contain the live or attenuated strains of the pathogens of microbes referred as antigens, which are administered in the body by the oral or parenteral route to produce the antibody against that specific antigens in the body to prevent the specific disease, generally used as prophylaxis, But in case of the person with reduced immunity it can produce the same disease for which it is intended to prevent, because in the case of reduced immunity the body's capacity to produce antibody against that antigen is altered/ hampered. Hence "Vaccines can produce the disease it is intended to prevent in those with reduced immunity" is true statement about the vaccines.

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